[AMDGPU] Add wave barrier builtin

[AMDGPU] Add wave barrier builtin

The wave barrier represents the discardable barrier. Its main purpose is to
carry convergent attribute, thus preventing illegal CFG optimizations. All lanes
in a wave come to convergence point simultaneously with SIMT, thus no special
instruction is needed in the ISA. The barrier is discarded during code generation.

Differential Revision: https://reviews.llvm.org/D26584

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@287006 91177308-0d34-0410-b5e6-96231b3b80d8